Exercise treadmill



FIG. 1 is a front perspective view of an exercise treadmill showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevational view thereof;

FIG. 7 is a rear elevational view thereof;

FIG. 8 is a left side elevational view thereof showing the design in an alternate condition; and,

FIG. 9 is a right side elevational view thereof. 

The ornamental design for an exercise treadmill, substantially as shown and described. 